Artificial-tooth fastening.



W. J. CURRY.- ARTIFICIAL mom FASTEMNG.

APPLICATION FILED MAY 24. l9l7- I Patented'Apr. 16, 1918.

INVENTOR WZZz'amJ Curry.

BY am ATTORNEYS ARTIFICIAL-TOOTH FASTENING.

Specification of Letters Patent.

Patented Apr. is, 1918.

Application filed May 24, 1917. Serial No. 170,738.

0 all whom it may concern:

Be it known that 1, WILLIAM J. (lunar, a citizen of the Dominion of Canada, residing at Vancouver, in the Province of British teeth side by side in the curvature of the frontal arch of the jaw and in a provision for maintaining the tooth securing means at a definite position from those of adjacent teeth, while the backings are being soldered together in a bridge or plate.

The device contains other features of improvement to which attention will be drawn in the following specification, reference being made to the drawings by which it is accompanied, in which:

Figure 1 is a side elevation of the tooth body on an enlarged scale.

Fig. 2, a section of the same on 22 in Fig. 1. 4

Fig. 3 is a perspective view of the tooth backing.

Fig. 4, a vertical section, and

Fig. 5, a plan of the same.

Fig. 6 is a horizontal section showing a series of teeth as attached to form a bridge or plate, and

Figs. 7 and 8 illustrate the flow of the solder to the front edge of thetooth backing.

Fig. 9 is a section similar to Fig. 4, showing the flow of solder on back of backing.

As shown in these drawings, the back 2 of the artificial tooth body slopes backward from the cervix to the crown and has a groove 3 on each side 4 adjacent and substantially parallel to the front. From these grooves 3 the sides 4 slope together in planes which are approximately normal to the curvature of the jaw, the reason for which will be fully explained later.

Where the plane of the back 2 intersects the line the grooves 3 a shoulder 5 is carried across the back, which removes the acute angle left at the intersection of each groove and also provides a definite shoulder to receive the bite of the tooth. It also incidentally enables a shorter tooth to be used where re quired, without reducing the strength of the attachment.

The backing of thin sheet metal'by which this tooth body is secured to the structure, whether bridge or plate, by which the teeth are connected to the jaw, conforms at 7 to the slope of the back 2 and is bent around each side as at 8 to engage at 9 the groove 3 of the tooth body.

Opposite each inwardly turned portion 9 is a similar outwardly turned portion 10 which is designed not only to strengthen the edges but serves as an edge border up to which the solder may flow and acts as a gage to definitely locate the next tooth backing fastening at its required position in the frontal arch, and also provides a clear space 12, (see Fig. 6) 'within whichthe solder 13 will flow in joining the several tooth backings toopposed grooves are primarily intendedto receive the cement with which the tooth body is secured in its backing and form a retaining key. The groove 11 serves also to reinforce the thin plate at the back and provide a gage to regulate the flow of solder over the connected tooth backings.

It is also advantageous while the teeth are being assembled in wax preparatory to soldering, as the outward projection of the groove 11 retains the backing in the wax while the teeth are being removed.

The outwardly turned edge 10 is further beneficial in that it provides an edge border up to which the solder will flow, as shown in Fig. 8, instead of, as in Fig. 7, leaving a rounded edge.

The oppositely turned edges 9 and 10 may be folded from the thin sheet metal of which the backing is made, or the metal may be factory-rolled with these double edges.

An eminently satisfactory and convenient means is thus provided for removably securing teeth in the jaw denture as the teeth and their backing attachments may be standardized and supplied to dentists in a form ready for. assembling to meet individual requirements.

Having now particularly described my invention, I herebyldeclare that what I claim as new and desire to be ters Patent, is:

1. A means for removably securing an artificial tooth in the jaw denture, said means comprising in combination, a tooth body having a back sloping inward from the cervix to the crown of the tooth, and a groove along each side adjacent and substantially parallel to the front face of the tooth, the sides of the tooth body from the groove to the back being normal to the curvature of the jaw, a tooth backing of thin sheet metal conforming to the shape of the back and'sides of the tooth body and having edges inwardly turned to engage the side grooves.

2. A means for removably securing an artificial tooth in the jaw denture, said means comprising in combination, a tooth body having a back sloping inward from the cervix to the crown of the tooth, and a groove along eachside adjacent and substantially parallel to the front face of the tooth, the sides of the tooth body from the groove to the back being normal to the curvature of the jaw, a tooth backing of thin sheet metal conforming to the shape of the back and sides of the tooth body and having edges inwardly turned to engage the side grooves and outwardly turned to form an outer border to the sides.

3. A means for removably securing an artificial tooth in the denture, said means comprising in combination, a tooth body having a back sloping inward from the cervix to the crown of the tooth, and a groove along each side adjacent and substantially parallel to the front face of the tooth, the sides of the tooth from the groove to the back being plane surfaces and the back face of the tooth havin a groove across it at the intersection of it with the side grooves, said grooves offering a shoulder to resist pressure along the plane of the grooves, and a tooth backin of thin sheet metal conforming to the back and sides of the tooth body and having edges inwardly turned to engage the grooves.

4. A means for removably securing an artificial tooth in the jaw denture, said means comprising in combination, a tooth body having a back slopin inward from the cervix to the crown of t e tooth, and a groove along each side adjacent and sub stantiall parallel to the front face of the tooth, tie sides of the tooth from the protected in by Let *groove to the back being plane surfaces and sides of the tooth body and having edges inwardly turned to engage the grooves and outwardly turned to form an edge border to the sides.

5. A means for removably securing an artificial tooth in the jaw denture, said means comprising in combination, a tooth body having a back sloping inward from the cervix to the crown of the tooth, and a groove along each side adjacent and substantially parallel to the front face of the tooth, the sides of the tooth from the groove to the back being plane surfaces and the backface of the tooth having a groove across it at the intersection of it with the side grooves, said grooves offering a shoulder to resist pressure along the plane of the grooves, and a tooth backing of thin sheet metal conforming to the back and sides of the tooth body and having edges inwardly turned to engage the grooves, the back face of the body and the face of the backin which contacts therewith having oppose locking grooves.

6. A means for removably securing an artificial tooth in the jaw denture, said means comprising in combination, a tooth body having a back sloping inward from the cervix to the crown of the tooth, and a groove along each side adjacent and substantially parallel to the front face of the tooth, the sides of the tooth from the groove to the back being plane surfaces and the back face of the tooth having a groove across it at the intersection of it with the side grooves, said grooves offering a shoulder to resist pressure along the plane of the grooves, and a tooth backing of thin sheet metal conforming to the back and sides of the tooth body and having edges inwardly turned to engage the grooves, the back face of the body and the face of the backin which contacts therewith having opposed locking grooves, the groove of the backing being swaged from the metal thereof to outwardly project as a bead from the back.

In testimony whereof ll afiix my si nature.

WILLIAM J. CU RY. 

